[PATCH v6 07/10] lib: other kernel glue layer code

From: Hajime Tazaki
Date: Thu Sep 03 2015 - 10:17:59 EST

These files are used to provide the same function calls so that other
network stack code keeps untouched.

Signed-off-by: Hajime Tazaki <thehajime@xxxxxxxxx>
Signed-off-by: Christoph Paasch <christoph.paasch@xxxxxxxxx>
---
arch/lib/capability.c | 25 +++++
arch/lib/filemap.c | 32 ++++++
arch/lib/fs.c | 70 +++++++++++++
arch/lib/glue.c | 284 ++++++++++++++++++++++++++++++++++++++++++++++++++
arch/lib/modules.c | 36 +++++++
arch/lib/pid.c | 29 ++++++
arch/lib/print.c | 56 ++++++++++
arch/lib/proc.c | 36 +++++++
arch/lib/random.c | 54 ++++++++++
arch/lib/sysfs.c | 83 +++++++++++++++
arch/lib/vmscan.c | 26 +++++
11 files changed, 731 insertions(+)
create mode 100644 arch/lib/capability.c
create mode 100644 arch/lib/filemap.c
create mode 100644 arch/lib/fs.c
create mode 100644 arch/lib/glue.c
create mode 100644 arch/lib/modules.c
create mode 100644 arch/lib/pid.c
create mode 100644 arch/lib/print.c
create mode 100644 arch/lib/proc.c
create mode 100644 arch/lib/random.c
create mode 100644 arch/lib/sysfs.c
create mode 100644 arch/lib/vmscan.c

diff --git a/arch/lib/capability.c b/arch/lib/capability.c
new file mode 100644
index 000000000000..3a1f30129fb7
--- /dev/null
+++ b/arch/lib/capability.c
@@ -0,0 +1,25 @@
+/*
+ * glue code for library version of Linux kernel
+ * Copyright (c) 2015 INRIA, Hajime Tazaki
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@xxxxxxxxx>
+ * Hajime Tazaki <tazaki@xxxxxxxxxxxxxx>
+ */
+
+#include "linux/capability.h"
+
+struct sock;
+struct sk_buff;
+
+int file_caps_enabled = 0;
+
+int cap_netlink_send(struct sock *sk, struct sk_buff *skb)
+{
+ return 0;
+}
+
+bool file_ns_capable(const struct file *file, struct user_namespace *ns,
+ int cap)
+{
+ return true;
+}
diff --git a/arch/lib/filemap.c b/arch/lib/filemap.c
new file mode 100644
index 000000000000..ce424ffae8c2
--- /dev/null
+++ b/arch/lib/filemap.c
@@ -0,0 +1,32 @@
+/*
+ * glue code for library version of Linux kernel
+ * Copyright (c) 2015 INRIA, Hajime Tazaki
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@xxxxxxxxx>
+ * Hajime Tazaki <tazaki@xxxxxxxxxxxxxx>
+ * Frederic Urbani
+ */
+
+#include "sim.h"
+#include "sim-assert.h"
+#include <linux/fs.h>
+
+
+ssize_t generic_file_aio_read(struct kiocb *a, const struct iovec *b,
+ unsigned long c, loff_t d)
+{
+ lib_assert(false);
+
+ return 0;
+}
+
+int generic_file_readonly_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ return -ENOSYS;
+}
+
+ssize_t
+generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
+{
+ return 0;
+}
diff --git a/arch/lib/fs.c b/arch/lib/fs.c
new file mode 100644
index 000000000000..33efe5f1da32
--- /dev/null
+++ b/arch/lib/fs.c
@@ -0,0 +1,70 @@
+/*
+ * glue code for library version of Linux kernel
+ * Copyright (c) 2015 INRIA, Hajime Tazaki
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@xxxxxxxxx>
+ * Hajime Tazaki <tazaki@xxxxxxxxxxxxxx>
+ * Frederic Urbani
+ */
+
+#include <fs/mount.h>
+
+#include "sim-assert.h"
+
+__cacheline_aligned_in_smp DEFINE_SEQLOCK(mount_lock);
+unsigned int dirtytime_expire_interval;
+
+void __init mnt_init(void)
+{
+}
+
+/* Implementation taken from vfs_kern_mount from linux/namespace.c */
+struct vfsmount *kern_mount_data(struct file_system_type *type, void *data)
+{
+ static struct mount local_mnt;
+ static int count = 0;
+ struct mount *mnt = &local_mnt;
+ struct dentry *root = 0;
+
+ /* XXX */
+ if (count != 0) return &local_mnt.mnt;
+ count++;
+
+ memset(mnt, 0, sizeof(struct mount));
+ if (!type)
+ return ERR_PTR(-ENODEV);
+ int flags = MS_KERNMOUNT;
+ char *name = (char *)type->name;
+
+ if (flags & MS_KERNMOUNT)
+ mnt->mnt.mnt_flags = MNT_INTERNAL;
+
+ root = type->mount(type, flags, name, data);
+ if (IS_ERR(root))
+ return ERR_CAST(root);
+
+ mnt->mnt.mnt_root = root;
+ mnt->mnt.mnt_sb = root->d_sb;
+ mnt->mnt_mountpoint = mnt->mnt.mnt_root;
+ mnt->mnt_parent = mnt;
+ /* DCE is monothreaded , so we do not care of lock here */
+ list_add_tail(&mnt->mnt_instance, &root->d_sb->s_mounts);
+
+ return &mnt->mnt;
+}
+void inode_wait_for_writeback(struct inode *inode)
+{
+}
+void truncate_inode_pages_final(struct address_space *mapping)
+{
+}
+int dirtytime_interval_handler(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+unsigned int nr_free_buffer_pages(void)
+{
+ return 65535;
+}
diff --git a/arch/lib/glue.c b/arch/lib/glue.c
new file mode 100644
index 000000000000..bdbed913ee9e
--- /dev/null
+++ b/arch/lib/glue.c
@@ -0,0 +1,284 @@
+/*
+ * glue code for library version of Linux kernel
+ * Copyright (c) 2015 INRIA, Hajime Tazaki
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@xxxxxxxxx>
+ * Hajime Tazaki <tazaki@xxxxxxxxxxxxxx>
+ * Frederic Urbani
+ */
+
+#include <linux/types.h> /* loff_t */
+#include <linux/errno.h> /* ESPIPE */
+#include <linux/pagemap.h> /* PAGE_CACHE_SIZE */
+#include <linux/limits.h> /* NAME_MAX */
+#include <linux/statfs.h> /* struct kstatfs */
+#include <linux/bootmem.h> /* HASHDIST_DEFAULT */
+#include <linux/utsname.h>
+#include <linux/binfmts.h>
+#include <linux/init_task.h>
+#include <linux/sched/rt.h>
+#include <linux/backing-dev.h>
+#include <stdarg.h>
+#include "sim-assert.h"
+#include "sim.h"
+#include "lib.h"
+
+
+struct pipe_buffer;
+struct file;
+struct pipe_inode_info;
+struct wait_queue_t;
+struct kernel_param;
+struct super_block;
+
+/* defined in sched.c, used in net/sched/em_meta.c */
+unsigned long avenrun[3];
+/* defined in mm/page_alloc.c */
+struct pglist_data __refdata contig_page_data;
+/* defined in linux/mmzone.h mm/memory.c */
+struct page *mem_map = 0;
+/* used by sysinfo in kernel/timer.c */
+int nr_threads = 0;
+/* not very useful in mm/vmstat.c */
+atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
+
+/* XXX: used in network stack ! */
+unsigned long num_physpages = 0;
+unsigned long totalram_pages = 0;
+
+/* XXX figure out initial value */
+unsigned int interrupt_pending = 0;
+static unsigned long g_irqflags = 0;
+static unsigned long local_irqflags = 0;
+int overflowgid = 0;
+int overflowuid = 0;
+int fs_overflowgid = 0;
+int fs_overflowuid = 0;
+unsigned long sysctl_overcommit_kbytes __read_mostly;
+DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
+static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly;
+const struct cpumask *const cpu_possible_mask = to_cpumask(cpu_possible_bits);
+
+struct backing_dev_info noop_backing_dev_info = {
+ .name = "noop",
+ .capabilities = 0,
+};
+
+/* from rt.c */
+int sched_rr_timeslice = RR_TIMESLICE;
+/* from main.c */
+bool initcall_debug;
+bool static_key_initialized __read_mostly = false;
+unsigned long __start_rodata, __end_rodata;
+
+unsigned long arch_local_save_flags(void)
+{
+ return local_irqflags;
+}
+void arch_local_irq_restore(unsigned long flags)
+{
+ local_irqflags = flags;
+}
+
+
+unsigned long long nr_context_switches(void)
+{
+ /* we just need to return >0 to avoid the warning
+ in kernel/rcupdate.c */
+ return 1;
+}
+
+
+long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
+ unsigned long start, unsigned long nr_pages,
+ int write, int force, struct page **pages,
+ struct vm_area_struct **vmas)
+{
+ /* in practice, this function is never called. It's linked in because */
+ /* we link in get_user_pages_fast which is included only because it */
+ /* is located in mm/util.c */
+ lib_assert(false);
+ return 0;
+}
+
+
+void dump_stack(void)
+{
+ /* we assert to make sure that we catch whoever calls dump_stack */
+ lib_assert(false);
+}
+
+
+void lib_printf(const char *str, ...)
+{
+ va_list args;
+
+ va_start(args, str);
+ lib_vprintf(str, args);
+ va_end(args);
+}
+
+#include <linux/vmalloc.h>
+#include <linux/kmemleak.h>
+
+static unsigned long __meminitdata nr_kernel_pages = 8192;
+static unsigned long __meminitdata nr_all_pages = 81920;
+/*
+ * allocate a large system hash table from bootmem
+ * - it is assumed that the hash table must contain an exact power-of-2
+ * quantity of entries
+ * - limit is the number of hash buckets, not the total allocation size
+ */
+void *__init alloc_large_system_hash(const char *tablename,
+ unsigned long bucketsize,
+ unsigned long numentries,
+ int scale,
+ int flags,
+ unsigned int *_hash_shift,
+ unsigned int *_hash_mask,
+ unsigned long low_limit,
+ unsigned long high_limit)
+{
+ unsigned long long max = high_limit;
+ unsigned long log2qty, size;
+ void *table = NULL;
+
+ /* allow the kernel cmdline to have a say */
+ if (!numentries) {
+ /* round applicable memory size up to nearest megabyte */
+ numentries = nr_kernel_pages;
+ numentries += (1UL << (20 - PAGE_SHIFT)) - 1;
+ numentries >>= 20 - PAGE_SHIFT;
+ numentries <<= 20 - PAGE_SHIFT;
+
+ /* limit to 1 bucket per 2^scale bytes of low memory */
+ if (scale > PAGE_SHIFT)
+ numentries >>= (scale - PAGE_SHIFT);
+ else
+ numentries <<= (PAGE_SHIFT - scale);
+
+ /* Make sure we've got at least a 0-order allocation.. */
+ if (unlikely(flags & HASH_SMALL)) {
+ /* Makes no sense without HASH_EARLY */
+ WARN_ON(!(flags & HASH_EARLY));
+ if (!(numentries >> *_hash_shift)) {
+ numentries = 1UL << *_hash_shift;
+ BUG_ON(!numentries);
+ }
+ } else if (unlikely((numentries * bucketsize) < PAGE_SIZE))
+ numentries = PAGE_SIZE / bucketsize;
+ }
+ numentries = roundup_pow_of_two(numentries);
+
+ /* limit allocation size to 1/16 total memory by default */
+ if (max == 0) {
+ max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4;
+ do_div(max, bucketsize);
+ }
+
+ if (numentries > max)
+ numentries = max;
+
+ log2qty = ilog2(numentries);
+
+ do {
+ size = bucketsize << log2qty;
+ if (flags & HASH_EARLY)
+ table = alloc_bootmem_nopanic(size);
+ else if (hashdist)
+ table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL);
+ else {
+ /*
+ * If bucketsize is not a power-of-two, we may free
+ * some pages at the end of hash table which
+ * alloc_pages_exact() automatically does
+ */
+ if (get_order(size) < MAX_ORDER) {
+ table = alloc_pages_exact(size, GFP_ATOMIC);
+ kmemleak_alloc(table, size, 1, GFP_ATOMIC);
+ }
+ }
+ } while (!table && size > PAGE_SIZE && --log2qty);
+
+ if (!table)
+ panic("Failed to allocate %s hash table\n", tablename);
+
+ pr_info("%s hash table entries: %d (order: %d, %lu bytes)\n",
+ tablename,
+ (1U << log2qty),
+ ilog2(size) - PAGE_SHIFT,
+ size);
+
+ if (_hash_shift)
+ *_hash_shift = log2qty;
+ if (_hash_mask)
+ *_hash_mask = (1 << log2qty) - 1;
+
+ return table;
+}
+
+void si_meminfo(struct sysinfo *val)
+{
+ /* This function is called from the ip layer to get information about
+ the amount of memory in the system and make some educated guesses
+ about some default buffer sizes. We pick a value which ensures
+ small buffers. */
+ val->totalram = 0;
+}
+int slab_is_available(void)
+{
+ /* called from kernel/param.c. */
+ return 1;
+}
+
+/* used from kern_ptr_validate from mm/util.c which is never called */
+void *high_memory = 0;
+
+
+
+void async_synchronize_full(void)
+{
+ /* called from drivers/base/ *.c */
+ /* there is nothing to do, really. */
+}
+
+int send_sig(int signal, struct task_struct *task, int x)
+{
+ struct SimTask *lib_task = container_of(task, struct SimTask,
+ kernel_task);
+
+ lib_signal_raised((struct SimTask *)lib_task, signal);
+ /* lib_assert (false); */
+ return 0;
+}
+unsigned long get_taint(void)
+{
+ /* never tainted. */
+ return 0;
+}
+void add_taint(unsigned flag, enum lockdep_ok lockdep_ok)
+{
+}
+struct pid *cad_pid = 0;
+
+void add_device_randomness(const void *buf, unsigned int size)
+{
+}
+
+int sched_rr_handler(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ return 0;
+}
+
+int sysctl_max_threads(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return 1;
+}
+
+void on_each_cpu_mask(const struct cpumask *mask,
+ smp_call_func_t func, void *info, bool wait)
+{
+}
diff --git a/arch/lib/modules.c b/arch/lib/modules.c
new file mode 100644
index 000000000000..ca43fdc691b0
--- /dev/null
+++ b/arch/lib/modules.c
@@ -0,0 +1,36 @@
+/*
+ * glue code for library version of Linux kernel
+ * Copyright (c) 2015 INRIA, Hajime Tazaki
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@xxxxxxxxx>
+ * Hajime Tazaki <tazaki@xxxxxxxxxxxxxx>
+ * Frederic Urbani
+ */
+
+#include "sim-assert.h"
+#include <linux/moduleparam.h>
+#include <linux/kmod.h>
+#include <linux/module.h>
+
+int modules_disabled = 0;
+char modprobe_path[KMOD_PATH_LEN] = "/sbin/modprobe";
+
+static struct module_version_attribute g_empty_attr_buffer;
+/* we make the array empty by default because, really, we don't need */
+/* to look at the builtin params */
+const struct kernel_param __start___param[] = {{0}} ;
+const struct kernel_param __stop___param[] = {{0}} ;
+const struct module_version_attribute *__start___modver[] = {
+ &g_empty_attr_buffer};
+const struct module_version_attribute *__stop___modver[] = {
+ &g_empty_attr_buffer};
+
+struct module_attribute module_uevent;
+struct ctl_table usermodehelper_table[] = {};
+
+int __request_module(bool wait, const char *fmt, ...)
+{
+ /* we really should never be trying to load modules that way. */
+ /* lib_assert (false); */
+ return 0;
+}
diff --git a/arch/lib/pid.c b/arch/lib/pid.c
new file mode 100644
index 000000000000..00cf7b620c43
--- /dev/null
+++ b/arch/lib/pid.c
@@ -0,0 +1,29 @@
+/*
+ * glue code for library version of Linux kernel
+ * Copyright (c) 2015 INRIA, Hajime Tazaki
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@xxxxxxxxx>
+ * Hajime Tazaki <tazaki@xxxxxxxxxxxxxx>
+ */
+
+#include <linux/pid.h>
+#include "sim.h"
+#include "sim-assert.h"
+
+void put_pid(struct pid *pid)
+{
+}
+pid_t pid_vnr(struct pid *pid)
+{
+ return pid_nr(pid);
+}
+struct task_struct *find_task_by_vpid(pid_t nr)
+{
+ lib_assert(false);
+ return 0;
+}
+struct pid *find_get_pid(int nr)
+{
+ lib_assert(false);
+ return 0;
+}
diff --git a/arch/lib/print.c b/arch/lib/print.c
new file mode 100644
index 000000000000..09b1bb54790a
--- /dev/null
+++ b/arch/lib/print.c
@@ -0,0 +1,56 @@
+/*
+ * glue code for library version of Linux kernel
+ * Copyright (c) 2015 INRIA, Hajime Tazaki
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@xxxxxxxxx>
+ * Hajime Tazaki <tazaki@xxxxxxxxxxxxxx>
+ */
+
+#include <stdarg.h>
+#include <linux/string.h>
+#include <linux/printk.h>
+#include "sim.h"
+#include "sim-assert.h"
+
+int dmesg_restrict = 1;
+
+/* from lib/vsprintf.c */
+int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
+
+int printk(const char *fmt, ...)
+{
+ va_list args;
+ static char buf[256];
+ int value;
+
+ va_start(args, fmt);
+ value = vsnprintf(buf, 256, printk_skip_level(fmt), args);
+ lib_printf("<%c>%s", printk_get_level(fmt), buf);
+ va_end(args);
+ return value;
+}
+void panic(const char *fmt, ...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ lib_vprintf(fmt, args);
+ va_end(args);
+ lib_assert(false);
+}
+
+void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
+{
+ va_list args;
+
+ printk("%s:%d -- ", file, line);
+ va_start(args, fmt);
+ lib_vprintf(fmt, args);
+ va_end(args);
+}
+
+void warn_slowpath_null(const char *file, int line)
+{
+ printk("%s:%d -- ", file, line);
+}
+
diff --git a/arch/lib/proc.c b/arch/lib/proc.c
new file mode 100644
index 000000000000..3183d05f2c91
--- /dev/null
+++ b/arch/lib/proc.c
@@ -0,0 +1,36 @@
+/*
+ * glue code for library version of Linux kernel
+ * Copyright (c) 2014 Hajime Tazaki
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@xxxxxxxxx>
+ * Hajime Tazaki <tazaki@xxxxxxxxxxxxxx>
+ */
+
+#include <linux/fs.h>
+#include <linux/net.h>
+#include <linux/slab.h>
+#include <linux/proc_fs.h>
+#include <linux/string.h>
+#include <net/net_namespace.h>
+#include "sim-types.h"
+#include "sim-assert.h"
+#include "fs/proc/internal.h" /* XXX */
+
+struct proc_dir_entry;
+static char proc_root_data[sizeof(struct proc_dir_entry) + 4];
+
+static struct proc_dir_entry *proc_root_sim =
+ (struct proc_dir_entry *)proc_root_data;
+extern const struct inode_operations proc_link_inode_operations;
+
+void lib_proc_net_initialize(void)
+{
+ proc_root_sim->parent = proc_root_sim;
+ strcpy(proc_root_sim->name, "net");
+ proc_root_sim->mode = S_IFDIR | S_IRUGO | S_IXUGO;
+ proc_root_sim->subdir = RB_ROOT;
+ proc_root_sim->proc_iops = &proc_link_inode_operations;
+ init_net.proc_net = proc_root_sim;
+ init_net.proc_net_stat = proc_mkdir("stat", proc_root_sim);
+}
+
diff --git a/arch/lib/random.c b/arch/lib/random.c
new file mode 100644
index 000000000000..282678d31f03
--- /dev/null
+++ b/arch/lib/random.c
@@ -0,0 +1,54 @@
+/*
+ * glue code for library version of Linux kernel
+ * Copyright (c) 2015 INRIA, Hajime Tazaki
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@xxxxxxxxx>
+ * Hajime Tazaki <tazaki@xxxxxxxxxxxxxx>
+ */
+
+#include "sim.h"
+#include <linux/random.h>
+
+u32 random32(void)
+{
+ return lib_random();
+}
+
+void get_random_bytes(void *buf, int nbytes)
+{
+ char *p = (char *)buf;
+ int i;
+
+ for (i = 0; i < nbytes; i++)
+ p[i] = lib_random();
+}
+void srandom32(u32 entropy)
+{
+}
+
+u32 prandom_u32(void)
+{
+ return lib_random();
+}
+void prandom_seed(u32 entropy)
+{
+}
+
+void prandom_bytes(void *buf, size_t bytes)
+{
+ return get_random_bytes(buf, bytes);
+}
+
+#include <linux/sysctl.h>
+
+static int nothing;
+struct ctl_table random_table[] = {
+ {
+ .procname = "nothing",
+ .data = &nothing,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = proc_dointvec,
+ },
+ {}
+};
diff --git a/arch/lib/sysfs.c b/arch/lib/sysfs.c
new file mode 100644
index 000000000000..2def2caab454
--- /dev/null
+++ b/arch/lib/sysfs.c
@@ -0,0 +1,83 @@
+/*
+ * glue code for library version of Linux kernel
+ * Copyright (c) 2015 INRIA, Hajime Tazaki
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@xxxxxxxxx>
+ * Hajime Tazaki <tazaki@xxxxxxxxxxxxxx>
+ */
+
+#include <linux/sysfs.h>
+#include <linux/kobject.h>
+#include "sim.h"
+#include "sim-assert.h"
+
+int sysfs_create_bin_file(struct kobject *kobj,
+ const struct bin_attribute *attr)
+{
+ return 0;
+}
+void sysfs_remove_bin_file(struct kobject *kobj,
+ const struct bin_attribute *attr)
+{
+}
+int sysfs_create_dir(struct kobject *kobj)
+{
+ return 0;
+}
+int sysfs_create_link(struct kobject *kobj, struct kobject *target,
+ const char *name)
+{
+ return 0;
+}
+int sysfs_move_dir(struct kobject *kobj,
+ struct kobject *new_parent_kobj)
+{
+ return 0;
+}
+void sysfs_remove_dir(struct kobject *kobj)
+{
+}
+void sysfs_remove_group(struct kobject *kobj,
+ const struct attribute_group *grp)
+{
+}
+int sysfs_rename_dir(struct kobject *kobj, const char *new_name)
+{
+ return 0;
+}
+int __must_check sysfs_create_group(struct kobject *kobj,
+ const struct attribute_group *grp)
+{
+ return 0;
+}
+int sysfs_create_groups(struct kobject *kobj,
+ const struct attribute_group **groups)
+{
+ return 0;
+}
+int sysfs_schedule_callback(struct kobject *kobj,
+ void (*func)(
+ void *), void *data, struct module *owner)
+{
+ return 0;
+}
+void sysfs_delete_link(struct kobject *dir, struct kobject *targ,
+ const char *name)
+{
+}
+void sysfs_exit_ns(enum kobj_ns_type type, const void *tag)
+{
+}
+void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr)
+{
+}
+int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
+{
+ kobj->sd = lib_malloc(sizeof(struct kernfs_node));
+ return 0;
+}
+int sysfs_create_file_ns(struct kobject *kobj, const struct attribute *attr,
+ const void *ns)
+{
+ return 0;
+}
diff --git a/arch/lib/vmscan.c b/arch/lib/vmscan.c
new file mode 100644
index 000000000000..3132f66d5085
--- /dev/null
+++ b/arch/lib/vmscan.c
@@ -0,0 +1,26 @@
+/*
+ * glue code for library version of Linux kernel
+ * Copyright (c) 2015 INRIA, Hajime Tazaki
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@xxxxxxxxx>
+ * Hajime Tazaki <tazaki@xxxxxxxxxxxxxx>
+ */
+
+#include <linux/mm.h>
+#include <linux/shrinker.h>
+
+/*
+ * Add a shrinker callback to be called from the vm
+ */
+int register_shrinker(struct shrinker *shrinker)
+{
+ return 0;
+}
+
+/*
+ * Remove one
+ */
+void unregister_shrinker(struct shrinker *shrinker)
+{
+}
+
--
2.1.0

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